test(web): make the minimized-card test prove the keyboard guard

The assertion only observed an absence, so it passed even when the
document keydown listener was missing entirely. Answer once while the
card is expanded, then assert the count does not grow after minimizing.

Author: elkaix

apps/pythinker-web/test/question-card-lifecycle.test.ts

@@ -107,9 +107,16 @@ describe('QuestionCard lifecycle', () => {
     const wrapper = mountCard(question(new Date(Date.now() + 20 * 60_000).toISOString()));
 
     document.dispatchEvent(new KeyboardEvent('keydown', { key: '1', bubbles: true }));
+    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Enter', bubbles: true }));
+    const answerCount = wrapper.emitted('answer')?.length ?? 0;
+
+    expect(answerCount).toBe(1);
+
     await wrapper.find('.qmin').trigger('click');
+
+    document.dispatchEvent(new KeyboardEvent('keydown', { key: '1', bubbles: true }));
     document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Enter', bubbles: true }));
 
-    expect(wrapper.emitted('answer')).toBeUndefined();
+    expect(wrapper.emitted('answer')).toHaveLength(answerCount);
   });
 });